libmng_data.h

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           mng_uint16        iGlobalBKGDred;     /* global bKGD fields */
           mng_uint16        iGlobalBKGDgreen;
           mng_uint16        iGlobalBKGDblue;
#endif /* MNG_SUPPORT_DISPLAY */

        } mng_savedata;

typedef mng_savedata * mng_savedatap;

/* ************************************************************************** */
/* *                                                                        * */
/* * Internal buffer structure for data push mechanisms                     * */
/* *                                                                        * */
/* ************************************************************************** */

typedef struct {
           mng_ptr           pNext;              /* for linked list */
           mng_ptr           pData;              /* used for chunks & data */
           mng_uint32        iLength;
           mng_bool          bOwned;
           mng_uint8p        pDatanext;          /* only used for data */
           mng_uint32        iRemaining;
        } mng_pushdata;
typedef mng_pushdata * mng_pushdatap;

/* ************************************************************************** */
/* *                                                                        * */
/* * The main libmng data structure                                         * */
/* *                                                                        * */
/* * The handle used in all functions points to this structure which        * */
/* * contains all volatile data necessary to process the network graphic.   * */
/* *                                                                        * */
/* ************************************************************************** */

typedef struct mng_data_struct {

           mng_uint32        iMagic;             /* magic number to validate
                                                    a given handle */     
           mng_ptr           pUserdata;          /* application workdata */

           mng_imgtype       eSigtype;           /* image information */
           mng_imgtype       eImagetype;         /* initially zeroed */
           mng_uint32        iWidth;             /* filled after header is processed */
           mng_uint32        iHeight;
           mng_uint32        iTicks;             /* these only after MHDR */
           mng_uint32        iLayercount;
           mng_uint32        iFramecount;
           mng_uint32        iPlaytime;
           mng_uint32        iSimplicity;
           mng_uint8         iAlphadepth;        /* indicates expected alpha-depth */

           mng_uint32        iImagelevel;        /* level of image inside a stream */

           mng_uint32        iCanvasstyle;       /* layout of the drawing-canvas */
           mng_uint32        iBkgdstyle;         /* layout of the background-canvas */

           mng_int8          iMagnify;           /* magnification factor (not used yet) */
           mng_uint32        iOffsetx;           /* x-offset for extremely large image */
           mng_uint32        iOffsety;           /* y-offset for extremely large image */
           mng_uint32        iCanvaswidth;       /* real canvas size */
           mng_uint32        iCanvasheight;      /* must be set by processheader callback */

           mng_uint16        iBGred;             /* default background color */
           mng_uint16        iBGgreen;           /* initially "black" */
           mng_uint16        iBGblue;
           mng_bool          bUseBKGD;           /* preferred use of bKGD for PNG */

           mng_bool          bIssRGB;            /* indicates sRGB system */

#ifdef MNG_FULL_CMS                              /* little CMS variables */
           mng_cmsprof       hProf1;             /* image input profile */
           mng_cmsprof       hProf2;             /* default output profile */
           mng_cmsprof       hProf3;             /* default sRGB profile */
           mng_cmstrans      hTrans;             /* current transformation handle */
#endif

           mng_float         dViewgamma;         /* gamma calculation variables */
           mng_float         dDisplaygamma;      /* initially set for sRGB conditions */
           mng_float         dDfltimggamma;

           mng_bool          bStorechunks;       /* switch for storing chunkdata */
           mng_bool          bSectionbreaks;     /* indicate NEEDSECTIONWAIT breaks */
           mng_bool          bCacheplayback;     /* switch to cache playback info */
           mng_bool          bDoProgressive;     /* progressive refresh for large images */
           mng_uint32        iCrcmode;           /* CRC existence & checking flags */

           mng_speedtype     iSpeed;             /* speed-modifier for animations */

           mng_uint32        iMaxwidth;          /* maximum canvas size */
           mng_uint32        iMaxheight;         /* initially set to 1024 x 1024 */

           mng_int32         iErrorcode;         /* error reporting fields */
           mng_int8          iSeverity;
           mng_int32         iErrorx1;
           mng_int32         iErrorx2;
           mng_pchar         zErrortext;

           mng_memalloc      fMemalloc;          /* callback pointers */
           mng_memfree       fMemfree;           /* initially nulled */
           mng_releasedata   fReleasedata;
#ifndef MNG_NO_OPEN_CLOSE_STREAM
           mng_openstream    fOpenstream;
           mng_closestream   fClosestream;
#endif
           mng_readdata      fReaddata;
           mng_writedata     fWritedata;
           mng_errorproc     fErrorproc;
           mng_traceproc     fTraceproc;
           mng_processheader fProcessheader;
           mng_processtext   fProcesstext;
           mng_processsave   fProcesssave;
           mng_processseek   fProcessseek;
           mng_processneed   fProcessneed;
           mng_processmend   fProcessmend;
           mng_processunknown fProcessunknown;
           mng_processterm   fProcessterm;
           mng_getcanvasline fGetcanvasline;
           mng_getbkgdline   fGetbkgdline;
           mng_getalphaline  fGetalphaline;
           mng_refresh       fRefresh;
           mng_gettickcount  fGettickcount;
           mng_settimer      fSettimer;
           mng_processgamma  fProcessgamma;
           mng_processchroma fProcesschroma;
           mng_processsrgb   fProcesssrgb;
           mng_processiccp   fProcessiccp;
           mng_processarow   fProcessarow;

#if defined(MNG_SUPPORT_READ) || defined(MNG_SUPPORT_WRITE)
#ifndef MNG_NO_OLD_VERSIONS
           mng_bool          bPreDraft48;        /* flags ancient style draft */
#endif

           mng_chunkid       iChunkname;         /* read/write-state variables */
           mng_uint32        iChunkseq;
           mng_chunkp        pFirstchunk;        /* double-linked list of */
           mng_chunkp        pLastchunk;         /* stored chunk-structures */

           mng_bool          bHasheader;         /* first header chunk processed */
           mng_bool          bHasMHDR;           /* inside a MHDR-MEND sequence */
           mng_bool          bHasIHDR;           /* inside a IHDR-IEND sequence */
           mng_bool          bHasBASI;           /* inside a BASI-IEND sequence */
           mng_bool          bHasDHDR;           /* inside a DHDR-IEND sequence */
#ifdef MNG_INCLUDE_JNG
           mng_bool          bHasJHDR;           /* inside a JHDR-IEND sequence */
           mng_bool          bHasJSEP;           /* passed the JSEP separator */
           mng_bool          bHasJDAA;           /* at least 1 JDAA processed */
           mng_bool          bHasJDAT;           /* at least 1 JDAT processed */
#endif
           mng_bool          bHasPLTE;           /* PLTE chunk processed */
           mng_bool          bHasTRNS;           /* tRNS chunk processed */
           mng_bool          bHasGAMA;           /* gAMA chunk processed */
           mng_bool          bHasCHRM;           /* cHRM chunk processed */
           mng_bool          bHasSRGB;           /* sRGB chunk processed */
           mng_bool          bHasICCP;           /* iCCP chunk processed */
           mng_bool          bHasBKGD;           /* bKGD chunk processed */
           mng_bool          bHasIDAT;           /* at least 1 IDAT processed */
           
           mng_bool          bHasSAVE;           /* SAVE chunk processed */
           mng_bool          bHasBACK;           /* BACK chunk processed */
           mng_bool          bHasFRAM;           /* FRAM chunk processed */
           mng_bool          bHasTERM;           /* TERM chunk processed */
           mng_bool          bHasLOOP;           /* at least 1 LOOP open */

           mng_bool          bHasglobalPLTE;     /* global PLTE chunk processed */
           mng_bool          bHasglobalTRNS;     /* global tRNS chunk processed */
           mng_bool          bHasglobalGAMA;     /* global gAMA chunk processed */
           mng_bool          bHasglobalCHRM;     /* global cHRM chunk processed */
           mng_bool          bHasglobalSRGB;     /* global sRGB chunk processed */
           mng_bool          bHasglobalICCP;     /* global iCCP chunk processed */
           mng_bool          bHasglobalBKGD;     /* global bKGD chunk processed */

           mng_uint32        iDatawidth;         /* IHDR/BASI/DHDR fields */
           mng_uint32        iDataheight;        /* valid if inside IHDR-IEND, */
           mng_uint8         iBitdepth;          /* BASI-IEND or DHDR-IEND */
           mng_uint8         iColortype;
           mng_uint8         iCompression;
           mng_uint8         iFilter;
           mng_uint8         iInterlace;

           mng_uint32        iPLTEcount;         /* PLTE fields */

#ifdef MNG_INCLUDE_JNG
           mng_uint8         iJHDRcolortype;     /* JHDR fields */
           mng_uint8         iJHDRimgbitdepth;   /* valid if inside JHDR-IEND */
           mng_uint8         iJHDRimgcompression;
           mng_uint8         iJHDRimginterlace;
           mng_uint8         iJHDRalphabitdepth;
           mng_uint8         iJHDRalphacompression;
           mng_uint8         iJHDRalphafilter;
           mng_uint8         iJHDRalphainterlace;
#endif

#endif /* MNG_SUPPORT_READ || MNG_SUPPORT_WRITE */

#ifdef MNG_SUPPORT_READ
           mng_bool          bReading;           /* read processing variables */
           mng_bool          bHavesig;
           mng_bool          bEOF;
           mng_uint32        iReadbufsize;
           mng_uint8p        pReadbuf;

           mng_uint32        iLargebufsize;      /* temp for very large chunks */
           mng_uint8p        pLargebuf;

           mng_uint32        iSuspendtime;       /* tickcount at last suspension */
           mng_bool          bSuspended;         /* input-reading has been suspended;
                                                    we're expecting a call to
                                                    mng_read_resume! */
           mng_uint8         iSuspendpoint;      /* indicates at which point the flow
                                                    was broken to suspend input-reading */
                                                    
           mng_bool          bSuspensionmode;    /* I/O-suspension variables */
           mng_uint32        iSuspendbufsize;
           mng_uint8p        pSuspendbuf;
           mng_uint8p        pSuspendbufnext;
           mng_uint32        iSuspendbufleft;
           mng_uint32        iChunklen;          /* chunk length */
           mng_uint8p        pReadbufnext;       /* 32K+ suspension-processing */
           mng_uint8p        pLargebufnext;

           mng_pushdatap     pFirstpushchunk;    /* variables for push mechanisms */
           mng_pushdatap     pLastpushchunk;
           mng_pushdatap     pFirstpushdata;
           mng_pushdatap     pLastpushdata;
#endif /* MNG_SUPPORT_READ */

#ifdef MNG_SUPPORT_WRITE
           mng_bool          bCreating;          /* create/write processing variables */